Re: Kernel debugging

Ty mike,

I am aware of kdgb, but it doesn't have gdb's abilities. Besides I
know extensibly gdb, and I can never find the Sysreq key on my
keyboard :-(. I will try it next time, but for now I solved my problem
by reading the kernel source code. I have noticed the remote_vis.c in
gdb sources. Does this mean I can use gdb remotely to a virtual host?
How can i do it? Furthermore have gdbstubs incorporated into gdb
sources, or is it another abandoned project (since 2003 :-()?

Nikos

On Fri, Dec 20, 2013 at 9:41 PM, Mike Frysinger <[email protected]> wrote:
> On Thursday 19 December 2013 13:51:36 Nikos Balkanas wrote:
>> I am developing a module for the Linux kernel. For that i have setup
>> the exact environment in Virtual Box and have loaded the (guest)
>> kernel with -g and removed the -frame-pointers. I will run gdb from
>> host and try to debug kernel on guest system.
>>
>> What is the best approach for this scenario? GDBserver or gdbstubs?.
>> Gdb server is good only for userspace debugging. Will gdbstubs work?
>> Are they included in the recent gdb sources, or are the ones to use
>> since 2003 from sourceforge? I am also looking for instructions on how
>> to implement them. Any hints?
>
> the kernel has a built in gdb stub.  look for "kgdb" in the
> documentation/kconfig.
> -mike